A simple Forth interpreter in Ruby. Originally written for ruby 1.9. This verison is being developed with ruby 3. A few older versions of ruby will be tried as time permits.

This is still a toy (i.e. not anywhere near being a "complete" implementation of forth).

A few minor examples:

1 2 dup + +
.
5

3 2 1 + *
.
9

: sq dup * ;

2 sq
.
4

This version is a fork of russ forth by ananthrk/fogus which was based on a sweet hack by Russ Olsen presented to fogus in a GoodReads comment.